One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,7)(3,8,4,6)(9,10)(11,14)(12,13)(15,16)(18,22)(19,26)(23,29)(27,31)(1,2)(3,6)(4,8)(5,7)(18,23)(19,27)(21,24)(22,29)(25,28)(26,31) involution — undirected(10,13)(14,16)(17,18,24,29,20,22,21,23)(19,28,31,30,26,25,27,32)(1,3,5,4)(2,6,7,8)(9,11,12,15)(10,14,13,16)(19,26)(25,28)(27,31)(30,32)(1,4,5,3)(2,6,7,8)(17,19,21,27,20,26,24,31)(18,25,23,30,22,28,29,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.